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On the electrochemical behavior of tin oxides in lithium-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2015. , 44 p.
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-262081OAI: oai:DiVA.org:uu-262081DiVA: diva2:852253
Available from: 2015-09-08 Created: 2015-09-08 Last updated: 2015-09-08Bibliographically approved
List of papers
1. On the electrochemistry of tin oxide coated tin electrodes in lithium-ion batteries
Open this publication in new window or tab >>On the electrochemistry of tin oxide coated tin electrodes in lithium-ion batteries
2015 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 179, 482-494 p.Article in journal (Refereed) Published
Abstract [en]

As tin based electrodes are of significant interest in the development of improved lithium-ion batteries it is important to understand the associated electrochemical reactions. In this work it is shown that the electrochemical behavior of SnO2 coated tin electrodes can be described based on the SnO2 and SnO conversion reactions, the lithium tin alloy formation and the oxidation of tin generating SnF2. The CV, XPS and SEM data, obtained for electrodeposited tin crystals on gold substrates, demonstrates that the capacity loss often observed for SnO2 is caused by the reformed SnO2 layer serving as a passivating layer protecting the remaining tin. Capacities corresponding up to about 80 % of the initial SnO2 capacity could, however, be obtained by cycling to 3.5 V vs. Li+/Li. It is also shown that the oxidation of the lithium tin alloy is hindered by the rate of the diffusion of lithium through a layer of tin with increasing thickness and that the irreversible oxidation of tin to SnF2 at potentials larger than 2.8 V vs. Li+/Li is due to the fact that SnF2 is formed below the SnO2 layer. This improved electrochemical understanding of the SnO2/Sn system should be valuable in the development of tin based electrodes for lithium-ion batteries.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-262075 (URN)10.1016/j.electacta.2015.02.150 (DOI)000362292200059 ()
Funder
Swedish Foundation for Strategic Research
Available from: 2015-09-08 Created: 2015-09-08 Last updated: 2017-12-04Bibliographically approved
2. Electrochemical behavior of tin(IV) oxide electrodes in lithium-ion batteries at elevated temperatures
Open this publication in new window or tab >>Electrochemical behavior of tin(IV) oxide electrodes in lithium-ion batteries at elevated temperatures
(English)Manuscript (preprint) (Other academic)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-262079 (URN)
Available from: 2015-09-08 Created: 2015-09-08 Last updated: 2015-09-09Bibliographically approved

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Böhme, Solveig

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